Not an answer, but just noting - as of Nov 7th, 2021, I am also seeing the same issue: Reboot / Error panic(cpu 2 caller 0xffffff8012ffea25): userspace watchdog timeout: no successful checkins from com.apple.logd in 120 seconds service returned not alive with context : unresponsive dispatch queue(s): com.apple.firehose.io-wl  service: com.apple.logd, total successful checkins since wake (630420 seconds ago): 63030, last successful checkin: 120 seconds ago service: com.apple.WindowServer, total successful checkins since wake (630420 seconds ago): 63042, last successful checkin: 0 seconds ago service: com.apple.remoted, total successful checkins since wake (630420 seconds ago): 63042, last successful checkin: 0 seconds ago Backtrace (CPU 2), Frame : Return Address 0xffffffa1250e3670 : 0xffffff800fc8cfdd  0xffffffa1250e36c0 : 0xffffff800fdd3fd3  0xffffffa1250e3700 : 0xffffff800fdc45ca  0xffffffa1250e3750 : 0xffffff800fc31a2f  0xffffffa1250e3770 : 0xffffff800fc8c7fd  0xffffffa1250e3890 : 0xffffff800fc8caf3  0xffffffa1250e3900 : 0xffffff801049ce34  0xffffffa1250e3970 : 0xffffff8012ffea25  0xffffffa1250e3980 : 0xffffff8012ffe660  0xffffffa1250e39a0 : 0xffffff801041d67e  0xffffffa1250e39f0 : 0xffffff8012ffda34  0xffffffa1250e3b20 : 0xffffff801042792b  0xffffffa1250e3c80 : 0xffffff800fd7f7d1  0xffffffa1250e3d90 : 0xffffff800fc9265d  0xffffffa1250e3e00 : 0xffffff800fc68cd5  0xffffffa1250e3e60 : 0xffffff800fc801e2  0xffffffa1250e3ef0 : 0xffffff800fda869d  0xffffffa1250e3fa0 : 0xffffff800fc32216        Kernel Extensions in backtrace:          com.apple.driver.watchdog(1.0)[4CFADD2A-613E-320D-AD14-9C9379E87CB7]@0xffffff8012ffc000->0xffffff8012ffefff Process name corresponding to current thread: watchdogd Boot args: chunklist-security-epoch=0 -chunklist-no-rev2-dev Mac OS version: 20G165 Kernel version: Darwin Kernel Version 20.6.0: Mon Aug 30 06:12:21 PDT 2021; root:xnu-7195.141.6~3/RELEASE_X86_64 Kernel UUID: C2591F4E-EE82-33CC-8C59-DB81D9AD80DD KernelCache slide: 0x000000000fa00000 KernelCache base:  0xffffff800fc00000 Kernel slide:      0x000000000fa10000 Kernel text base:  0xffffff800fc10000 __HIB  text base: 0xffffff800fb00000 System model name: MacBookPro16,1 (Mac-E1008331FDC96864) System shutdown begun: NO Hibernation exit count: 0 System uptime in nanoseconds: 718934128341995 Last Sleep:           absolute           base_tsc          base_nano   Uptime  : 0x00028ddde5563764   Sleep   : 0x0000508032a29fd7 0x0000cfcc98d439c6 0x0000507437a96b0e   Wake    : 0x000050806593b56e 0x0000d50048f77b8a 0x0000508044b285c5 last started kext at 20950649609: >!APlatformEnabler 2.7.0d0 (addr 0xffffff7faa71c000, size 8192) loaded kexts: com.Logitech.Unifying.HIDDriver 3.9.14 com.Logitech.ControlCenter.HIDDriver 3.9.14 >!APlatformEnabler 2.7.0d0 >X86PlatformShim 1.0.0 >AGPM 122.1 @filesystems.autofs 3.0 @fileutil 20.036.15 >AudioAUUC 1.70 >!ATopCaseHIDEventDriver 4050.1 >!AHIDALSService 1 @kext.AMDRadeonX6000 4.0.6 @kext.AMDRadeonServiceManager 4.0.6 >!AUpstreamUserClient 3.6.8 >!AGraphicsDevicePolicy 6.3.5 @AGDCPluginDisplayMetrics 6.3.5 >!A!IKBLGraphics 16.0.5 >pmtelemetry 1 |IOUserEthernet 1.0.1 >AGDCBacklightControl 6.3.5 >!ABacklight 180.3 >usb.!UUserHCI 1 >!A!ICFLGraphicsFramebuffer 16.0.5 |IO!BSerialManager 8.0.5d7 >ACPI_SMC_PlatformPlugin 1.0.0 @Dont_Steal_Mac_OS_X 7.0.0 >!AHV 1 >!ADiskImages2 1 >!AFIVRDriver 4.1.0 >!ABridgeAudio!C 140.4 >BridgeAudioCommunication 140.4 >!AAVEBridge 6.1 >!AMuxControl2 6.3.5 >!AThunderboltIP 4.0.3 >!AMCCSControl 1.14 >!A!ISlowAdaptiveClocking 4.0.0 >!AGFXHDA 100.1.433 >!A!IPCHPMC 2.0.1 >usb.!UHostBillboardDevice 1.0 |SCSITaskUserClient 436.140.1 >usb.realtek8153patcher 5.0.0 >BCMWLANFirmware4378.Hashstore 1 >BCMWLANFirmware4377.Hashstore 1 >BCMWLANFirmware4364.Hashstore 1 >BCMWLANFirmware4355.Hashstore 1 >!AFileSystemDriver 3.0.1 @filesystems.tmpfs 1 @filesystems.hfs.kext 556.100.11 @BootCache 40 @!AFSCompression.!AFSCompressionTypeZlib 1.0.0 @!AFSCompression.!AFSCompressionTypeDataless 1.0.0d1 >!ABCMWLANBusInterfacePCIeMac 1 @filesystems.apfs 1677.141.2 @private.KextAudit 1.0 >!ASmartBatteryManager 161.0.0 >!AACPIButtons 6.1 >!ASMBIOS 2.1 >!AACPIEC 6.1 >!AAPIC 1.7 @!ASystemPolicy 2.0.0 @nke.applicationfirewall 311 |IOKitRegistryCompatibility 1 |EndpointSecurity 1 @kext.triggers 1.0 >!AHIDKeyboard 224 >!AHS!BDriver 4050.1 >!AActuatorDriver 4440.3 >!AMultitouchDriver 4440.3 >!AInputDeviceSupport 4400.35 @kext.AMDRadeonX6100HWLibs 1.0 @kext.AMDRadeonX6000HWServices 4.0.6 |IO!BHost!CUARTTransport 8.0.5d7 |IO!BHost!CTransport 8.0.5d7 >usb.cdc.acm 5.0.0 >usb.serial 6.0.0 >!ABacklightExpert 1.1.0 |IOAccelerator!F2 442.9 >IOPlatformPluginLegacy 1.0.0 >X86PlatformPlugin 1.0.0 |IOAVB!F 940.4 |IOEthernetAVB!C 1.1.0 >!ASMBusPCI 1.0.14d1 >IO!BHIDDriver 8.0.5d7 >!UAudio 405.39 >!AGraphicsControl 6.3.5 >!AThunderboltEDMSink 5.0.3 >!AThunderboltDPOutAdapter 8.1.4 >!ASMBus!C 1.0.18d1 @!AGPUWrangler 6.3.5 |IOSlowAdaptiveClocking!F 1.0.0 >!A!ILpssUARTv1 3.0.60 >!A!ILpssUARTCommon 3.0.60 >!AOnboardSerial 1.0 >!AHDA!C 283.15 |IOHDA!F 283.15 |IONDRVSupport 585.1 |IOAudio!F 300.6.1 @vecLib.kext 1.2.0 @kext.AMDRadeonX6000Framebuffer 4.0.6 @kext.AMDSupport 4.0.6 @!AGraphicsDeviceControl 6.3.5 |IOGraphics!F 585.1 >IOPlatformPlugin!F 6.0.0d8 @plugin.IOgPTPPlugin 985.2 >usb.IOUSBHostHIDDevice 1.2 >usb.cdc.ncm 5.0.0 >usb.cdc.ecm 5.0.0 >usb.cdc 5.0.0 >usb.networking 5.0.0 >usb.!UHostCompositeDevice 1.2 >usb.!UHub 1.2 >!AThunderboltPCIDownAdapter 4.1.1 >!AThunderboltDPInAdapter 8.1.4 >!AThunderboltDPAdapter!F 8.1.4 >!AHPM 3.4.4 >!A!ILpssI2C!C 3.0.60 >!A!ILpssI2C 3.0.60 >!A!ILpssDmac 3.0.60 >!ABSDKextStarter 3 |IOSurface 290.8.1 @filesystems.hfs.encodings.kext 1 >!ABCMWLANCoreMac 1.0.0 |IOSerial!F 11 |IO80211!FV2 1200.12.2b1 |IOSkywalk!F 1 >mDNSOffloadUserClient 1.0.1b8 >IOImageLoader 1.0.0 >corecapture 1.0.4 >!AXsanScheme 3 >usb.!UVHCIBCE 1.2 >usb.!UVHCICommonBCE 1.0 >usb.!UVHCI 1.2 >usb.!UVHCICommon 1.0 >!AEffaceableNOR 1.0 |IOBufferCopy!C 1.1.0 |IOBufferCopyEngine!F 1 |IONVMe!F 2.1.0 >!AThunderboltNHI 7.2.8 |IOThunderbolt!F 9.3.2 >usb.!UHostPacketFilter 1.0 |IOUSB!F 900.4.2 >usb.!UXHCIPCI 1.2 >usb.!UXHCI 1.2 >!AEFINVRAM 2.1 >!AEFIRuntime 2.1 >!ASMCRTC 1.0 |IOSMBus!F 1.1 |IOHID!F 2.0.0 $!AImage4 3.0.0 |IOTimeSync!F 985.2 |IONetworking!F 3.4 >DiskImages 493.0.0 |IO!B!F 8.0.5d7 |IOReport!F 47 |IO!BPacketLogger 8.0.5d7 $quarantine 4 $sandbox 300.0 @kext.!AMatch 1.0.0d1 |CoreAnalytics!F 1 >!ASSE 1.0 >!AKeyStore 2 >!UTDM 511.141.1 |IOUSBMass!SDriver 184.140.2 |IOSCSIBlockCommandsDevice 436.140.1 |IO!S!F 2.1 |IOSCSIArchitectureModel!F 436.140.1 >!AMobileFileIntegrity 1.0.5 @kext.CoreTrust 1 >!AFDEKeyStore 28.30 >!AEffaceable!S 1.0 >!ACredentialManager 1.0 >KernelRelayHost 1 |IOUSBHost!F 1.2 >!UHostMergeProperties 1.2 >usb.!UCommon 1.0 >!ABusPower!C 1.0 >!ASEPManager 1.0.1 >IOSlaveProcessor 1 >!AACPIPlatform 6.1 >!ASMC 3.1.9 |IOPCI!F 2.9 |IOACPI!F 1.4 >watchdog 1 @kec.pthread 1 @kec.corecrypto 11.1 @kec.Libm 1